Colloques du Collège de France - Collège de France

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Colloques interdisciplinaires du Collège de France Événements de la vie scientifique de l'établissement, les colloques, dont le programme comprend à la fois des professeurs du Collège de France et des conférenciers invités, traite de thèmes aux nombreuses ramifications, dont les enjeux contemporains gagnent à être analysés au prisme des disciplines et des champs du savoir.

  1. 16 ABR

    Colloque - Hugo Defienne : Quantum Imaging with Entangled Photons

    Pascale Senellart Chaire annuelle Innovation technologique Liliane Bettencourt (2025-2026) Collège de France Année 2025-2026 Colloque : Light-based Quantum Technologies Pascale Senellart, chaire Innovation technologique Liliane Bettencourt Colloque - Hugo Defienne : Quantum Imaging with Entangled Photons Résumé Entanglement stands as a foundational resource in quantum technologies. Lacking a classical equivalent, it theoretically guarantees superior performance over classical systems, provided it plays a non-trivial role in the underlying process. However, in the field of optical imaging, demonstrating the indispensable nature of entanglement remains a significant challenge. Most current applications rely on optical correlations derived from entangled states - features that can often be emulated by classical sources - rendering entanglement a sufficient, rather than strictly necessary, component. In this presentation, we explore imaging scenarios where entanglement becomes a critical and non-trivial asset. Specifically, I will discuss recent experimental studies utilizing entangled photon states to image through scattering media, highlighting regimes where quantum entanglement provides a definitive advantage over classical alternatives. And, as a nod to the foundations of quantum mechanics, the presentation will be illustrated with the mandatory pictures of cats! Hugo Defienne Hugo Defienne's research focuses on quantum optics, imaging, and complex media. He is a researcher at the CNRS at Sorbonne University in Paris, where he heads the Quantum Imaging Paris group. He completed his doctoral thesis at the Kastler-Brossel Laboratory in Paris, where he studied quantum optics in disordered media. He graduated in 2016 and then turned his attention to quantum imaging in his postdoctoral research at Princeton University and then at the University of Glasgow. He became a lecturer in Glasgow before returning to Paris in 2022 to set up his own group at the CNRS thanks to a grant awarded to early-career scientists by the European Research Council.

    40 min

  2. 16 ABR

    Colloque - Anaïs Dréau : Single Color Centers for Silicon-Based Quantum Technologies

    Pascale Senellart Chaire annuelle Innovation technologique Liliane Bettencourt (2025-2026) Collège de France Année 2025-2026 Colloque : Light-based Quantum Technologies Pascale Senellart, chaire Innovation technologique Liliane Bettencourt Colloque - Anaïs Dréau : Single Color Centers for Silicon-Based Quantum Technologies Anaïs Dréau Résumé Capitalizing on the success of the microelectronics and integrated photonics industries, silicon is the material that has generated the most scientific interest for quantum technologies and offers currently the greatest diversity of integrated quantum systems. Recently, in 2020, a new type of physical systems in silicon has emerged for quantum applications: individual color centers. These fluorescent point defects can be isolated at single defect-scale using low-temperature confocal microscopy, and emit single photons directly at telecom wavelengths, suitable for long-distance propagations in optical fibers. Furthermore, some of these defects are also coupled to an optically detectable electron spin that could be used to store and process quantum information.

    41 min

  3. 16 ABR

    Colloque - Hugues de Riedmatten : Quantum Memories for Quantum Networks

    Pascale Senellart Chaire annuelle Innovation technologique Liliane Bettencourt (2025-2026) Collège de France Année 2025-2026 Colloque : Light-based Quantum Technologies Pascale Senellart, chaire Innovation technologique Liliane Bettencourt Colloque - Hugues de Riedmatten : Quantum Memories for Quantum Networks Hugues de Riedmatten Résumé The distribution of entanglement between the nodes of a quantum network will allow new advances e.g. in long distance quantum communication, distributed quantum computing and quantum sensing. The realization of large-scale quantum networks—also known as quantum internet—will require quantum repeaters to enable quantum communication over distances much longer than the fiber attenuation length. The nodes of a quantum repeater are matter systems that should efficiently interact with quantum light, allow entanglement with photons (ideally at telecommunication wavelengths) and serve as a quantum memory allowing long-lived, faithful and multiplexed storage of entangled quantum bits.

    44 min

  4. 16 ABR

    Colloque - Adriana E. Lita : Development of Superconducting Single-Photon Detectors for Quantum Information Applications

    Pascale Senellart Chaire annuelle Innovation technologique Liliane Bettencourt (2025-2026) Collège de France Année 2025-2026 Colloque : Light-based Quantum Technologies Pascale Senellart, chaire Innovation technologique Liliane Bettencourt Colloque - Adriana E. Lita : Development of Superconducting Single-Photon Detectors for Quantum Information Applications Adriana E. Lita Résumé Single-photon detectors are a key enabling technology for the realization of light-based quantum information applications. These devices operate at the fundamental limit of electromagnetic signal strength, which places stringent requirements on their performance. The quest for an ideal single-photon detector aims to combine as many of the following performance metrics as possible: near-unity detection efficiency, ultra-low dark count rates, fast temporal response, and photon-number-resolving capability, all across a wide spectral range.  In this presentation I will review the development and latest performance records achieved by single-photon detectors, with a focus on superconducting detectors such as Superconducting Nanowires Single-Photon Detectors (SNSPDs) and Transition-Edge Sensors (TESs). I will highlight how these detectors have redefined the state-of-the-art and conclude by showcasing representative applications in quantum information science and related fields.

    42 min

  5. 16 ABR

    Colloque - Alexia Auffèves : An Energetic Perspective on Fundamental Processes in Quantum Optics

    Pascale Senellart Chaire annuelle Innovation technologique Liliane Bettencourt (2025-2026) Collège de France Année 2025-2026 Colloque : Light-based Quantum Technologies Pascale Senellart, chaire Innovation technologique Liliane Bettencourt Colloque - Alexia Auffèves : An Energetic Perspective on Fundamental Processes in Quantum Optics Alexia Auffèves Résumé For the emerging field of quantum energetics, a crucial motivation is to understand how quantum features impact energy and entropy exchanges in the quantum realm. Energetic footprint of quantum coherence and entanglement, irreversibility of quantum measurement and decoherence are typical research topics in the field. By staging simple interacting systems like atoms and photons, quantum optics provides a convenient scenery to study these effects. In this talk I will present a new framework to analyse energy and entropy exchanges in quantum optics, and apply it to elementary mechanisms: spontaneous and stimulated emission, coherent driving, driven-dissipative dynamics. I will showcase a few recent experimental results to illustrate the operationality of this framework before concluding on the impact of this research on the energy cost of quantum technologies.

    44 min

  6. 16 ABR

    Colloque - Antoine Heidmann : Listening to the Universe with Quantum Light: Quantum technologies for gravitational-wave detection

    Pascale Senellart Chaire annuelle Innovation technologique Liliane Bettencourt (2025-2026) Collège de France Année 2025-2026 Colloque : Light-based Quantum Technologies Pascale Senellart, chaire Innovation technologique Liliane Bettencourt Colloque - Antoine Heidmann : Listening to the Universe with Quantum Light: Quantum technologies for gravitational-wave detection Antoine Heidmann Résumé Gravitational waves have opened a new way of observing the Universe, but their detection relies on laser interferometers operating at the very edge of what quantum physics allows. Quantum light — and in particular squeezed states — has become a key resource for improving detector sensitivity and overcoming quantum noise. This presentation highlights how squeezing and frequency-dependent squeezing are implemented in gravitational wave detectors such as LIGO and Virgo to enhance gravitational wave detection over a broad frequency range, and illustrates how quantum technologies developed for sensing play an essential role in fundamental research.

    34 min

  7. 16 ABR

    Colloque - Christine Silberhorn : Scaling Photonic Systems for Quantum Information Processing

    Pascale Senellart Chaire annuelle Innovation technologique Liliane Bettencourt (2025-2026) Collège de France Année 2025-2026 Colloque : Light-based Quantum Technologies Pascale Senellart, chaire Innovation technologique Liliane Bettencourt Colloque - Christine Silberhorn : Scaling Photonic Systems for Quantum Information Processing Christine Silberhorn Résumé Photonic systems represent a promising physical platform for realizing quantum computing, offering low-noise operation, room-temperature compatibility, and access to inherently high-dimensional optical modes. A key challenge for scaling these systems into practical quantum processors is the realization of engineered quantum light sources, efficient multiplexing schemes, and reconfigurable photonic circuits within compact architectures.

    45 min

  8. 16 ABR

    Colloque - Serge Haroche : Rydberg Atoms Interacting with Light: From Bohr's Atom to Quantum Simulations

    Pascale Senellart Chaire annuelle Innovation technologique Liliane Bettencourt (2025-2026) Collège de France Année 2025-2026 Colloque : Light-based Quantum Technologies Pascale Senellart, chaire Innovation technologique Liliane Bettencourt Colloque - Serge Haroche : Rydberg Atoms Interacting with Light: From Bohr's Atom to Quantum Simulations Serge Haroche Professeur du Collège de France, Administrateur du Collège de France (2012-2015)

    1 h 3 min
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Colloques interdisciplinaires du Collège de France Événements de la vie scientifique de l'établissement, les colloques, dont le programme comprend à la fois des professeurs du Collège de France et des conférenciers invités, traite de thèmes aux nombreuses ramifications, dont les enjeux contemporains gagnent à être analysés au prisme des disciplines et des champs du savoir.

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